---
title: "Cloud DB for MSSQL troubleshooting"
slug: "clouddbformssql-troubleshoot"
updated: 2026-09-17T09:04:19Z
published: 2026-09-17T09:30:08Z
canonical: "guide.ncloud-docs.com/clouddbformssql-troubleshoot"
stale: true
---

> ## Documentation Index
> Fetch the complete documentation index at: https://guide.ncloud-docs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Cloud DB for MSSQL troubleshooting

Available in Classic and VPC

This document details problems users may have while using Cloud DB for MSSQL, as well their solutions. Click each issue to navigate to the relevant page.

## Common issues

You may experience the following common issues.

[MSSQL Server connection error](/docs/en/clouddbformssql-troubleshoot-common#MSSQLServer%EC%A0%91%EC%86%8D%EC%98%A4%EB%A5%98) Error occurs when accessing MSSQL Server. Cannot access MSSQL Server from outside.

[Using linked server](/docs/en/clouddbformssql-troubleshoot-common#linkedserver%EC%82%AC%EC%9A%A9) Cannot use linked servers in Cloud DB for MSSQL.

[Mirror server replication error](/docs/en/clouddbformssql-troubleshoot-common#Mirror%EC%84%9C%EB%B2%84%EB%B3%B5%EC%A0%9C%EC%98%A4%EB%A5%98) Error occurs when replicating to Mirror server.

[Notifications on exceeding MSSQL Server threshold](/docs/en/clouddbformssql-troubleshoot-common#MSSQLServer%EC%9D%98%EC%9E%84%EA%B3%84%EA%B0%92%EC%B4%88%EA%B3%BC%EC%95%8C%EB%A6%BC) Unable to receive an event notification on exceeding MSSQL Server threshold.

[Unable to access database](/docs/en/clouddbformssql-troubleshoot-common#%EB%8D%B0%EC%9D%B4%ED%84%B0%EB%B2%A0%EC%9D%B4%EC%8A%A4%EC%A0%91%EA%B7%BC%EB%B6%88%EA%B0%80) Cannot access the database as it has been restarted and is in a "restoring" state.

[Perform Failover](/docs/en/clouddbformssql-troubleshoot-common#failover%EC%88%98%ED%96%89) Perform Failover to reproduce Failover situation caused by Principal Server failure to check any effects on applications prior to opening the service.

[Synchronization error](/docs/en/clouddbformssql-troubleshoot-common#%EB%8F%99%EA%B8%B0%ED%99%94%EC%98%A4%EB%A5%98) The database synchronization was not performed properly.

## Error message

You may experience the following common issues.

[Access Denied error](/docs/en/clouddbformssql-troubleshoot-error#AccessDenied%EC%98%A4%EB%A5%98) Access Denied error occurs.

[Signature error](/docs/en/clouddbformssql-troubleshoot-error#Signature%EC%98%A4%EB%A5%98) Signature error occurs.

["A WebException with status NameResolutionFailure was thrown" error](/docs/en/clouddbformssql-troubleshoot-error#a-webexception-with-status-nameresolutionfailure-was-thrown-%EC%98%A4%EB%A5%98) "A WebException with status NameResolutionFailure was thrown" error occurs.

["Server does not exists" error](/docs/en/clouddbformssql-troubleshoot-error#Serverdoesnotexists%EC%98%A4%EB%A5%98) "Server does not exists" error occurs.

## Content to explore

NAVER Cloud Platform provides information in various formats to assist you. The following introduces useful content when using Cloud DB for MSSQL:

- FAQs: [frequently asked questions for Cloud DB for MSSQL](https://www.ncloud.com/support/faq/prod?categoryCode2=DB&categoryCode3=SV_0029&page=1)
- NAVER Cloud Platform blog: [get MSSQL DB query level analytics in the cloud](https://blog.naver.com/n_cloudplatform/221251087202?trackingCode=blog_bloghome_searchlist)

          Note

          

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